Learning is not a one-way street. Teachers teach students, but students also teach teachers. I was reminded of that recently while working on one of Haydn's last sonatas, No. 52 in Eb. I was noticing how he was using more of the piano than his earlier works, fuller chords, lots of 32nd notes, and greater contrast between dramatic and lighter sections. As I played, I thought, "this reminds me of Beethoven!" I always teach my students that Mozart and Haydn were friends and in